From The Manufacturer/Wikipedia/People Smarter Than Us:
Back when the West was still wild and the rifle was the tool of choice for survival and frontier justice, the venerable .44-caliber put more meat on the table and outlaws in the ground than any other bullet. The West may have been tamed and fenced long ago, but its unbridled spirit lives on in this line of traditional big-bore Henry rifles. Choose from .44 Magnum, .45 Colt and .357 Magnum. All are SASS approved so Cowboy Action shooters who enjoy stepping back to that bygone era can use them in competition.